and not ever do any maintenance to it. you would make sure that it was safe. 100 years ago, teddy roosevelt was president, and your pipes were brand new. now, our infrastructure is old. 100, 200 years old. it's not been upgraded or fixed or replaced, sometimes, ever. man: if these systems are not maintained, sooner or later they're going to fail. they all have a life expectancy. if you don't maintain them and constantly check them and then do what's necessary to rehabilitate or repair, you're going to have a big problem. and they're going to collapse. they're going to fail. and all of a sudden, the water, or the sewage that normally goes through them, will not have any place to go. it'll back up into homes, it'll back up onto the street.